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@Autotron, it's true the plant has enough nutes for a week or so, but I NEVER wait to test that theory.
The plant may have enough to survive in its embryonic stage, but nutes in the mixture do encourage faster root growth. Go ahead with a general purpose mild formula of 1/4 tsp. per gallon grow, micro, bloom, diamond nectar, FloraBlend and 1mL Floralicious Plus. You can "mix-up" this strength by adding extra parts of each nutrient as the plant progresses. After one week I want 1/2tsp of each, so just add another 1/4 tsp. per gallon.
I like to start my seedlings in a little Folgers coffee can bubbler inside a 2" net pot until I get three nodes, and a good long root growth. Since you've started your girl directly in your DWC, be sure to raise the water level in your DWC container high enough to keep the rapid rooter plug moistened. You can go all the way up to the bottom of the rooter plug if you like. As soon as the roots hit water they will take off.
Tap water - are you in a part of the country with hard water? If so, do you have a water softener in your water supply line?
Root supplements - one day soon I intend to get to the bottom of this for hydro. No question whatsoever that myco's etc. are a good idea for dirt farmers. And many / most (myself included) use them in hydro. I'm not willing to quit just to see if it fucks up my roots, but I am curious what real effect it has in hydro. In order for mycorrhizae to inoculate your roots, they have to maintain direct contact with root matter. I am curious how this works in a hydro environment. Soon as I find a microscope slide of what this looks like I intend to do a bit more research on the subject. But that's a fall / winter project. In the meantime if you have root innoculants mos'def' use them, guaranteed it doesn't hurt.
Just realized I didn't really answer your question about the hardness of my water. I looked it up and apparently my tap water is classified as "moderately hard", between 5.5 and 7.5 grains per gallon of Total Hardness(100-125 milligrams per liter which is the same as PPM). The amount of calcium in my water is anywhere between 24-34 PPM. GH says to use their hard water Micro only if your calcium hardness is above 70 PPM, so I'm well within the safe zone(https://generalhydroponics.com/water/). Also, I do not use a water softener and no one on municipal water does as far as I know. Interesting how much I learned today by looking this up!
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